.back-to-top {
    position: fixed;
    bottom: 15px;
    right: 30px;
    width: 35px;
    height: 35px;
    background-color: var(--secondary-color);
    color: var(--primary-color);
    border: none;
    border-radius: 70%;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(100px);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

@media (max-width: 480px) {
    .back-to-top {
        right: 15px;
        bottom: 12px;
        width: 30px;
        height: 30px;
        font-size: 1.5rem;
    }
}